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Device and method for mineralizing and fixing CO2 and preparing fine calcium carbonate by carbide slag

A carbide slag, solid technology, applied in chemical instruments and methods, preparation/separation of calcium carbonate/strontium/barium, ammonia, etc., can solve the problem of lack of equipment design, consumption of carbonizing agent, not considering ammonia gas treatment and overflow risks, etc. problem, to achieve the effect of large-scale industrial application and easy to scale up

Pending Publication Date: 2021-03-30
YUANCHU TECH (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leaching agent is usually acid or acid salt, including hydrochloric acid, amino acid, fatty acid, ammonium chloride, etc., such as CN101264920B, CN101580257A, etc., use hydrochloric acid as the leaching agent, and obtain a calcium chloride solution by reacting calcium carbide slag with hydrochloric acid, and then chlorinate Calcium solution with carbonizing agent (sodium carbonate) or under alkaline conditions with CO 2 The reaction produces calcium carbonate precipitation. Although the process is simple, acid and alkali are continuously consumed in the process, and chloride salt waste liquid is produced. From the perspective of resource utilization and environment, it does not have the prospect of large-scale production.
CN101293663B, CN102992373A etc. prepare calcium carbonate with amino acid, fatty acid as leaching agent, the calcium carbonate of preparation has characteristics such as particle size is little, dispersibility is good, but use amino acid as leaching agent price more expensive, and use fatty acid as leaching agent because of It is more acidic than carbonic acid, so CO cannot be used 2 As a carbonizing agent, carbonizing agents (carbonates, bicarbonates, etc.) need to be consumed continuously, and large-scale industrial applications cannot be realized
[0004] To sum up, the currently disclosed methods for preparing calcium carbonate from carbide slag focus more on process design, lack of related equipment design, and cannot realize large-scale industrial application
At the same time, the above-mentioned related patents using ammonium chloride as the leaching agent did not consider the treatment of ammonia gas and the risk of spillage

Method used

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  • Device and method for mineralizing and fixing CO2 and preparing fine calcium carbonate by carbide slag
  • Device and method for mineralizing and fixing CO2 and preparing fine calcium carbonate by carbide slag
  • Device and method for mineralizing and fixing CO2 and preparing fine calcium carbonate by carbide slag

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Experimental program
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Effect test

Embodiment 1

[0055] Carbide slag raw material A was selected as the experimental raw material, and its main element composition is shown in Table 1.

[0056] Table 1 The main element composition of carbide slag raw material A

[0057]

[0058] Carbide slag raw material A is dried for 2 hours, and after removing volatile components such as sulfide and organic matter, it is ground to 100 mesh, and the ground carbide slag is added to the circulation from the solid / liquid material inlet 8 at a rate of 0.5kg / h. - Separation and integrated slag melting reactor 1 (height-to-diameter ratio is 9.5, the inner diameter ratio of the draft tube and the reactor is 0.75, the height ratio of the draft tube and the reactor is 0.84, the solid-liquid separator and the reactor The volume ratio is 0.3, and the ratio of the two diameters is 1:7:1), and at the same time, the ammonium chloride solution with a mass fraction of 10% is added to the circulation-separation by the solid / liquid material inlet 8 at a ...

Embodiment 2

[0060] The carbide slag A of Example 1 was selected as the experimental raw material, and the experimental process was basically the same, except that the carbide slag was pre-mixed to form a suspension and then added to the reactor, and different solution concentration parameters and reactor parameters were selected. The specific operations were as follows: Carbide slag raw material A was dried for 2 hours, after removing volatile components such as sulfide and organic matter therein, it was ground to 200 mesh, and the carbide slag after grinding was mixed with 6.39kg / h ammonium chloride solution ( The mass fraction is 20%) mixed to make a suspension from the solid / liquid material inlet 8 into the loop-separation integrated slag reactor I (height-to-diameter ratio is 8, and the inner diameter ratio of the draft tube and the reactor is 0.6 , the height ratio of the draft tube and the reactor is 0.7, the volume ratio of the solid-liquid separator to the reactor is 0.5, and the r...

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Abstract

The invention discloses a device and method for mineralizing and fixing CO2 and preparing fine calcium carbonate by carbide slag. The device is a novel circulation-separation-integrated slag dissolving reactor for leaching calcium components in carbide slag, and comprises an airlift circulation reactor, a solid-liquid separator and other accessories. The invention also provides a novel method forpreparing calcium carbonate by mineralizing and fixing CO2 by using carbide slag, which comprises the following circulation processes: a), putting carbide slag and a NH4Cl solution into a circulation-separation-integrated slag dissolving reactor, and introducing air to form circulation so as to obtain CaCl2 solution and NH3-containing air; b), absorbing the NH3-containing air with water to obtainammonia water; recycling air after NH3 is removed; c), introducing the CaCl2 solution and ammonia water into a mineralization tower to react with CO2 in the waste gas, and performing separating to obtain calcium carbonate and NH4Cl solution; and d), evaporating and concentrating the NH4Cl solution for recycling, and using evaporated water for absorbing ammonia gas to finish circulation; the device is easy to amplify, and large-scale industrial application is facilitated.

Description

technical field [0001] The present invention relates to CO 2 The field of capture and utilization, specifically related to a calcium carbide slag mineralization to fix CO 2 And the device and method for preparing fine calcium carbonate. Background technique [0002] With the consumption of a large amount of fossil energy, the CO in the atmosphere 2 The concentration increases year by year, and the resulting greenhouse effect becomes more and more serious. From 1906 to 2005, the global average temperature of the atmosphere close to the ground rose by 0.74°C. The global temperature increase brought about sea level rise and rainfall changes. These changes will lead to more frequent extreme weather events, such as floods, droughts, heat waves and hurricanes, which in turn will lead to lower crop yields, retreat of glaciers, loss of species and rampant diseases. CO 2 The large-scale storage and fixation of CO 2 The main ways to reduce emissions mainly include geological stor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18C01C1/02
CPCC01F11/18C01C1/022C01P2004/61C01P2006/60C01P2006/80
Inventor 于常军王麒魏巍
Owner YUANCHU TECH (BEIJING) CO LTD
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